You can use the following task to enable Identity Management for UNIX
(IDMU) to manage directory-based identity mapping for the SMB server in a
Windows environment. IDMU is an optional feature of Active Directory.

How to Enable Identity Management for UNIX Support

Before You Begin

Before you can use IDMU support, you must first install the IDMU
software on your Active Directory domain controller and use the UNIX Attributes
tab in the Active Directory Users and Computers tool to specify UIDs
and GIDs for your users.